I prefer the thomson style ones as it allows a more precise angle adjustment, similar to this
http://www.ebay.co.uk/itm/Zoom-Matt-Black-Seatpost-Seatpin-350mm-Length-For-Road-Mountain-Bike/111191294117?_trksid=p2054897.c100204.m3164&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20140407115239%26meid%3D9e9f3d706a964cdcb71e0edd18a55b9c%26pid%3D100204%26rk%3D27%26rkt%3D30%26sd%3D161053764619
@user48109 started
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I prefer the thomson style ones as it allows a more precise angle adjustment, similar to this
http://www.ebay.co.uk/itm/Zoom-Matt-Black-Seatpost-Seatpin-350mm-Length-For-Road-Mountain-Bike/111191294117?_trksid=p2054897.c100204.m3164&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20140407115239%26meid%3D9e9f3d706a964cdcb71e0edd18a55b9c%26pid%3D100204%26rk%3D27%26rkt%3D30%26sd%3D161053764619